问题
选择题
His sister left home in 1998, and__________ since.
A．had not been heard of
B．has not been heard of
C．had not heard of
D．has not heard of
答案
B。
句意为：他的妹妹在1998年离开家，自从那时就没有音讯了。用现在完成时的否定结构。
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